Speaking as Salah returned to training, Klopp said: "Fully recovered, he was fine. He is a very serious person and he know it's his career - if you can't, you can't. He looks full of joy, he's happy to be back."

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Salah was among those making the flight to the States from Manchester AirportCredit: JOHN MATHER/IMAGEVIEW

Liverpool are unbeaten so far in pre-season, with 7-0, 3-2 and 2-0 victories at Chester, Tranmere Rovers and Blackburn Rovers respectively, along with a 0-0 draw against Bury.

Sunday sees the beginning of their US-based International Champions Cup campaign, starting against Klopp's former side Borussia Dortmund in Charlotte, North Carolina, before facing Premier League champions Manchester City four days later.

They then meet Manchester United in front of more than 100,000 fans in Michigan before rounding out their extensive schedule against Napoli in Dublin and Torino at Anfield in August.

Midfielder Adam Lallana posted footage on Instagram of the players getting to grips with local culture after landing in the States, travelling to a NASCAR garage to try their hand at changing tyres.

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Lallana gave NASCAR pit crews a run for their moneyCredit: Instagram / @officiallallana

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The midfielder was sporting his new blonde mohicanCredit: Instagram / @officiallallana

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Lallana, 30, missed most of last season through injuryCredit: Instagram / @officiallallana